add ?details_boost_tree_lightgbm doc

also,
* re-knits rules xrf engine docs
* corrects link to bonsai pkgdown site

Author: simonpcouch

R/boost_tree_lightgbm.R

@@ -0,0 +1,13 @@
+#' Boosted trees via lightgbm
+#'
+#' [lightgbm::lgb.train()] creates a series of decision trees
+#'  forming an ensemble. Each tree depends on the results of previous trees.
+#'  All trees in the ensemble are combined to produce a final prediction.
+#'
+#' @includeRmd man/rmd/boost_tree_lightgbm.md details
+#'
+#' @name details_boost_tree_lightgbm
+#' @keywords internal
+NULL
+
+# See inst/README-DOCS.md for a description of how these files are processed

man/details_boost_tree_lightgbm.Rd

@@ -80,8 +80,7 @@ bonsai quiets much of the logging output from [lightgbm::lgb.train()] by default
 
 ## Examples 
 
-<!-- TODO: update url to bonsai pkgdown site -->
-The "Introduction to bonsai" article contains [examples](https://github.com/tidymodels/bonsai) of `boost_tree()` with the `"lightgbm"` engine.
+The "Introduction to bonsai" article contains [examples](https://bonsai.tidymodels.org/articles/bonsai.html) of `boost_tree()` with the `"lightgbm"` engine.
 
 ## References
 

man/details_boost_tree_xgboost.Rd

@@ -127,8 +127,7 @@ bonsai quiets much of the logging output from [lightgbm::lgb.train()] by default
 
 ## Examples 
 
-<!-- TODO: update url to bonsai pkgdown site -->
-The "Introduction to bonsai" article contains [examples](https://github.com/tidymodels/bonsai) of `boost_tree()` with the `"lightgbm"` engine.
+The "Introduction to bonsai" article contains [examples](https://bonsai.tidymodels.org/articles/bonsai.html) of `boost_tree()` with the `"lightgbm"` engine.
 
 ## References